Bump multihash from 0.16.0 to 0.18.0

Bumps [multihash](https://github.com/multiformats/rust-multihash) from 0.16.0 to 0.18.0.
- [Release notes](https://github.com/multiformats/rust-multihash/releases)
- [Changelog](https://github.com/multiformats/rust-multihash/blob/master/CHANGELOG.md)
- [Commits](multiformats/rust-multihash@v0.16.0...v0.18.0)

---
updated-dependencies:
- dependency-name: multihash
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -38,7 +38,7 @@ itertools = "0.10.5"
 lazy_static = "1.4.0"
 libp2p = { version = "0.50.0", features = [ "autonat", "dns", "identify", "floodsub", "gossipsub", "kad", "macros", "mplex", "noise", "request-response", "serde", "tcp", "tokio", "yamux" ]}
 log = { version = "0.4.17", features = ["max_level_trace", "release_max_level_trace"] }
-multihash = {version = "0.16.0", features = ["serde-codec"]}
+multihash = {version = "0.18.0", features = ["serde-codec"]}
 num-traits = "0.2.15"
 once_cell = "1.17"
 pin-utils = "0.1.0"

src/blockchain/Cargo.toml

@@ -15,7 +15,7 @@ futures-timer = "3.0.2"
 hex = "0.4.3"
 libp2p = { version = "0.50.0", features = [ "autonat", "dns", "identify", "floodsub", "gossipsub", "kad", "macros", "mplex", "noise", "request-response", "serde", "tcp", "tokio", "yamux" ]}
 log = "0.4"
-multihash = {version = "=0.16.0", features = ["serde-codec", "scale-codec"]}
+multihash = {version = "=0.18.0", features = ["serde-codec", "scale-codec"]}
 once_cell = "1.17"
 rand = "0.8.5"
 serde = { version = "1.0", features = ["derive"] }